Method of determining request transmission priority subject to request content and transmitting request subject to such request transmission priority in application of fieldbus communication framework

Abstract

A method of determining request transmission priority subject to request content and transmitting request subject to such request transmission priority in application of Fieldbus communication framework in which the communication device determines whether the received requests have the priority subject to the respective content, and also determines whether there is any logical operation condition established, and then the communication device transmits the received external requests to the connected slave device as an ordinary request or priority request, preventing the slave device from receiving an important external request sent by the main control end or manager at a late time.

Description

[0001]This application is a Continuation-In-Part of my patent application Ser. No. 11 / 687,665, filed on Mar. 18, 2007.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to request transmission methods and more particularly, to a method of determining request transmission priority subject to request content and transmitting request subject to such request transmission priority in application of Fieldbus communication framework, which determines, by means of a communication device, whether the content of each received external request has the priority right, and then transmits every request subject to the priority order, preventing the slave device from receiving an external request from the master device at a late time.[0004]2. Description of the Related Art[0005]Following fast development of communication technology, communication networks have also been well developed. LAN (Local Area Network) and WAN (Wide Area Network) are the original c...

AI Technical Summary

Benefits of technology

[0015]It is still another object of the present invention to provide a method of determining request transmission priority subject to request content and transmitting request subject to such request transmission priority in application of Fieldbus communication framework, which categorizes the priority right into kinds or levels so that different external req

Problems solved by technology

Ethernet cables (fiber optics or twisted pair) are limited in their reach, and these distances are insufficient to cover medium-sized and large network installations.

However, when traffic gets higher, gateway A needs much more time to handle received requests in received time order.

If there is an important request arrived at this time, the gateway A may unable to transmit it to the slave device B in time since there are too many un-handled requests received before.

This could result in many problems.

For example, in a regular industrial manufacturing line (such as wafer plant, plastic materials p

Images